Thomas Lee Crowell. (1961). Modern English workbook: Exercises and drillsfor advanced students. New York: McGraw-Hill.
Dyfyniad Arddull ChicagoThomas Lee Crowell. Modern English Workbook: Exercises and Drillsfor Advanced Students. New York: McGraw-Hill, 1961.
Dyfyniad MLAThomas Lee Crowell. Modern English Workbook: Exercises and Drillsfor Advanced Students. New York: McGraw-Hill, 1961.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.